Personally, I don't think switching it off or toning it down is going to work, because feelings are still there whether we choose to engage with them or not. I think it is important to acknowledge that these feelings are emerging and to accept them. They are a part of your process right now.
We sometimes sexualise our intense, childlike feelings towards our therapists because our adult brains don't know how to make sense of the intensity and the desire for affection other than to sexualise it. There may be an element of that, or it may be something else, but whatever's happening it's okay, very common, and your therapist probably would be very understanding. I get it though, shame is a powerful feeling and it's hard to overcome the fear that our feelings are wrong or unacceptable.